Table 5

Performances of the non-cycloplegic screening for three different thresholds of manifest astigmatism (true positive case if cycloplegic cylinder value by retinoscopy or on table refractor ⩾2 D)

Manifest cylinderPositive test n (%)Negative test
n (%)
Sensitivity (%)Specificity (%)PPV (%)NPV (%)
⩾2 D
 Right eye20 (23)68 (77)52958576
 Left eye25 (29)62 (71)65907687
⩾1.75 D
 Right eye23 (26)65 (74)58938378
 Left eye35 (40)52 (60)83816990
⩾1.5 D
 Right eye31 (35)57 (65)82938789
 Left eye40 (46)47 (54)89766594
  • PPV = positive predictive value.

  • NPV = negative predictive value.